Department of Physics
Condensed Matter Seminar

We report on recent functional renormalization group (fRG) studies on microscopic models for iron arsenide compounds. We find that while the general leading superconducting pairing instability is found to be of extended s-wave type, the degree of anisotropy sensitively depends on material-specific parameters for interaction and fermi surface topology where the range of possible scenarios includes nodal and non-nodal settings on the electron pockets. Opposed to earlier approaches we choose a gauge-invariant orbital representation of the vertex functions extracted from fRG and interpret the resulting form factors in orbital notation.